EP2592728A2 - Dispositif électromagnétique - Google Patents

Dispositif électromagnétique Download PDF

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Publication number
EP2592728A2
EP2592728A2 EP12183619.1A EP12183619A EP2592728A2 EP 2592728 A2 EP2592728 A2 EP 2592728A2 EP 12183619 A EP12183619 A EP 12183619A EP 2592728 A2 EP2592728 A2 EP 2592728A2
Authority
EP
European Patent Office
Prior art keywords
coils
rotor
power
electromagnetic device
sense
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12183619.1A
Other languages
German (de)
English (en)
Other versions
EP2592728B1 (fr
EP2592728A3 (fr
Inventor
Scott P. Wilkinson
Michael R. Hernden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hamilton Sundstrand Corp
Original Assignee
Hamilton Sundstrand Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hamilton Sundstrand Corp filed Critical Hamilton Sundstrand Corp
Publication of EP2592728A2 publication Critical patent/EP2592728A2/fr
Publication of EP2592728A3 publication Critical patent/EP2592728A3/fr
Application granted granted Critical
Publication of EP2592728B1 publication Critical patent/EP2592728B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the subject matter disclosed herein relates to electromagnetic devices and machines and, more particularly, to an arrangement for determining the position of a generator or motor rotor.
  • a generator In a power conversion system, such as a variable-speed, constant-frequency (VSCF) power generating system, a generator, typically a brushless, three-phase synchronous generator, is operated in a generating mode to convert variable-speed motive power supplied by a prime mover into variable-frequency alternating current (AC) power.
  • the prime mover may be, for example, a gas turbine engine of an aircraft.
  • the variable-frequency AC power produced by the generator is transmitted to a rectifier where it is rectified and provided as a direct current (DC) signal over a DC link to an inverter.
  • the inverter may then invert the DC signal on the DC link into constant-frequency AC power for supply over a load bus to one or more AC loads.
  • a generator can also be operated as a motor in a starting mode to convert electrical power supplied by an external AC power source into motive power which may in turn be provided to the prime mover to bring the prime mover up to self-sustaining speed.
  • the generator when operated in a starting mode, can be used to start a gas turbine engine of an aircraft.
  • a brushless, synchronous generator which can be operated in both a generating mode and a starting mode, includes a permanent magnet generator (PMG).
  • PMG permanent magnet generator
  • a position sensor such as a Hall Effect sensor.
  • the voltage across each Hall Effect sensor varies from zero to a maximum as a function of rotor position such that the outputs from the Hall Effect sensors are representative of the position of the rotor.
  • the output signals from the Hall Effect sensors are then used to control switching elements in the rectifier.
  • an electromagnetic device includes a stator defining a bore, a rotor rotatable within the stator bore and having permanent magnetic elements disposed about an outer surface thereof to define a series of magnetic poles, power coils configured to generate a power current as a first portion of the magnetic poles pass each of the power coils due to rotor rotation and sense coils configured to generate a sense current as a second portion of the magnetic poles pass each of the sense coils due to the rotor rotation.
  • an electromagnetic device includes a stator defining a bore, a rotor rotatable within the stator bore and having permanent magnetic elements disposed about an outer surface thereof to define a series of magnetic poles, power coils supportively wound in the stator about a first section of the rotor and configured to generate a power current as a first portion of the magnetic poles pass each of the power coils due to rotor rotation and sense coils supportively wound in the stator about a second section of the rotor and configured to generate a sense current as a second portion of the magnetic poles pass each of the sense coils due to the rotor rotation.
  • an electromagnetic device includes a stator defining a bore, a rotor rotatable within the stator bore and having permanent magnetic elements disposed about an outer surface thereof to define a series of twenty-eight magnetic poles, power coils supportively wound in the stator about a first section of the rotor and configured to generate a power current as at least twenty-five of the magnetic poles pass each of the power coils due to rotor rotation and sense coils magnetically and electrically decoupled from the power coils and supportively wound in the stator about a second section of the rotor, the sense coils being configured to generate a sense current as at least one of the remaining three of the magnetic poles pass each of the sense coils due to the rotor rotation.
  • FIG. 1 is an axial view of an electromagnetic device in accordance with embodiments
  • FIG. 2 is an axial view of an electromagnetic device in accordance with further embodiments
  • FIG. 3 is a schematic diagram illustrating an arrangement of power and sense coils of the electromagnetic device of FIGS. 1 and 2 in accordance with embodiments;
  • FIG. 4 is a schematic diagram illustrating an arrangement of power and sense coils of the electromagnetic device of FIGS. 1 and 2 in accordance with further embodiments.
  • FIG. 5 is a schematic diagram of a system for producing direct current (DC) output.
  • the electromagnetic device 10 includes a housing or stator 20, a rotor 30, power coils 50 and sense coils 60.
  • the stator 20 defines a bore 21 in which the rotor 30 is rotatably disposed.
  • the stator 20 has a body 22 that may be cast, molded, machined or formed of multiple laminations that are bonded together to define slots 23.
  • the body 22 may be formed as a single piece 24, as shown in FIG. 1 , or in multiple pieces 25 and 26, as shown in FIG. 2 . In either case, the body 22 may have a substantially cylindrical internal shape with the bore 21 defined to extend longitudinally through the body 22.
  • the rotor 30 is similarly substantially cylindrical and sized to fit within the bore 21 such that the rotor 30 is free to rotate about the longitudinal axis 31, which extends through a central longitudinal axis of the rotor 30.
  • the rotor 30 has a substantially cylindrical outer surface 32 that opposes a cylindrical inner facing surface of the bore 21.
  • Permanent magnetic elements 33 are disposed on or near this outer surface 32 and about the rotor 30 at one or more axial positions.
  • the permanent magnetic elements 33 are configured and arranged to define a series of magnetic poles 34 including north poles 341 and south poles 342, which are arranged in a repeating, alternating and substantially uniform series. In accordance with embodiments, twenty-eight magnetic poles 34 may be defined about the rotor 30.
  • the power coils 50 are supportively wound in the slots 23 of the body 22 of the stator 20 with, for example, a 2/3 pitch and a 3 phase "wye" connection.
  • the power coils 50 of which there may be an A-phase power coil 501, a B-phase power coil 502 and a C-phase power coil 503, thus form a series of windings 51 (i.e., 3-phase windings) that together encompass a region defined about a first section 52 of the rotor 30.
  • each of the magnetic poles 34 approaches and then recedes from each of the windings 51 of each of the power coils 50.
  • the flux field generated by this rotation thereby induces an alternating current in each of the power coils 50.
  • the power coils 50 are thus configured to generate a power current in a form of alternating current (AC) as a constantly changing first portion of the magnetic poles 34 pass each of the windings 51 of each of the power coils 50 due to the rotor rotation.
  • AC alternating current
  • the stator 20 also includes the sense coils 60 that are magnetically and electrically separated and insulated from the power coils 50 and, like the power coils 50, are also supportively wound in the slots 23 of the body 22 of the stator 20 with, for example, a 2/3 pitch and a delta or 3 phase "wye" connection.
  • the sense coils 60 of which there may be an A-phase sense coil 601, a B-phase sense coil 603 and a C-phase sense coil 602, thus form a series of windings 61 (i.e., 3-phase windings) that together encompass a region defined about a second section 62 of the rotor 30.
  • each of the magnetic poles 34 approaches and then recedes from each of the windings 61 of each of the sense coils 60.
  • the flux field generated by this rotation thereby induces an alternating current in each of the sense coils 60.
  • the sense coils 60 are thus configured to generate a sense current in a form of alternating current (AC) as a constantly changing second portion of the magnetic poles 34 pass each of the windings 61 of each of the sense coils 50 due to the rotor rotation.
  • AC alternating current
  • a current rotational position and/or speed of the one or more magnetic poles 34 inducing the sense current can be determined.
  • determining the current position of the one or more magnetic poles 34 inducing the sense current is effectively deterministic of the current position of each of the magnetic poles 34 about the rotor 30 and of the current rotational position and/or speed of the rotor 30.
  • the respective positions and movements of the magnetic poles 34 relative to the windings 51 of the power coils 50 can also be determined such that the AC output by the power coils 50 can be rectified with high precision and accuracy as will be described below.
  • This ability to rectify the AC output by the power coils 50 provides for an efficient operation of the electromagnetic device 10 that supersedes any loss of power dictated by the replacement of a number of power coils 50 at the second section 62 of the rotor 30 with a corresponding number of the sense coils 60.
  • the first section 52 of the rotor 30 encompasses at least twenty-five of the twenty-eight magnetic poles 34. These twenty-five magnetic poles 34 are constantly changing during the rotation of the rotor 30.
  • the second section 62 of the rotor 30 encompasses at least one of the remaining three of the twenty-eight magnetic poles 34, which are similarly constantly changing.
  • the sense coils 60 may be separated from the power coils 50 by an air gap 70.
  • the A-phase power coil 501 forms a series of windings 51 that lags the windings 51 of the C-phase power coil 503 by 30°.
  • the windings 51 of the C-phase power coil 503 lags the windings 51 of the B-phase power coil by 30°.
  • the sense coils 60 are disposed within the gap defined between electrical and polar opposite ends of the power coils 50 such that the sense coils 60 may be disposed in phase with the power coils 50 although this is not required as will be discussed below.
  • the A-phase sense coil 601 forms a winding 61 that trails the winding 61 of the C-phase sense coil 602 by 30°.
  • the winding 61 of the C-phase sense coil 602 trails the winding 61 of the B-phase sense coil 603 by 30°.
  • the sense coils 60 may be provided with a lead or lag phase shift relative to the phase of the power coils 50.
  • this phase shift is illustrated as a 30° lead phase shift although it is to be understood that this is merely exemplary and that a lead or lag phase shift is possible in varying degrees.
  • the processing unit 90 (see FIG. 5 ), which will be discussed below, may be provided with additional processing time to determine the rotational position and/or rotational speed of the rotor 30 and will be programmed to account for the additional time due to the phase shift.
  • a system 75 for producing direct current (DC) output includes the electromagnetic device 10 described above and further includes a driving element 80, a processing unit 90 and a rectifier 100.
  • the driving element 80 provides motive power to drive the rotation of the rotor 30 and may be, for example, a gas turbine engine whose drive shaft is coupled to or integrally formed with the rotor 30.
  • the processing unit 90 may include a digital signal processor and a memory/storage unit having executable instructions stored thereon. When executed, the executable instructions cause the digital signal processor to be receptive of the AC from the sense coils 60 and to determine the rotational position and/or speed of the rotor 30. It shall be understood, however, that the instructions could be implemented in hardware, firmware or a combination thereof.
  • the rectifier 100 is coupled to the processing unit 90 and configured to rectify the AC of the power coils 50 into an output of direct current (DC) voltage in accordance with the determined rotational position and/or speed of the rotor 30.
  • the rectifier 100 is receptive of the AC from the power coils 50 and may include a series of transistors 101, respectively coupled to the A-phase power coil 501, the B-phase power coil 502 and the C-phase power coil 503.
  • the transistors 101 operate by turning on and off at appropriate times based on the determined rotational position and/or speed of the rotor 30 to cooperatively produce the DC output from, for example, the peak values of the received AC current of the A-phase power coil 501, the B-phase power coil 502 and the C-phase power coil 503.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
EP12183619.1A 2011-11-09 2012-09-07 Dispositif électromagnétique Active EP2592728B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/292,832 US9300194B2 (en) 2011-11-09 2011-11-09 Electromagnetic device

Publications (3)

Publication Number Publication Date
EP2592728A2 true EP2592728A2 (fr) 2013-05-15
EP2592728A3 EP2592728A3 (fr) 2017-02-22
EP2592728B1 EP2592728B1 (fr) 2023-07-05

Family

ID=46939551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12183619.1A Active EP2592728B1 (fr) 2011-11-09 2012-09-07 Dispositif électromagnétique

Country Status (7)

Country Link
US (1) US9300194B2 (fr)
EP (1) EP2592728B1 (fr)
JP (1) JP2013102672A (fr)
KR (1) KR20130051398A (fr)
CN (1) CN103107667A (fr)
RU (1) RU2012137168A (fr)
ZA (1) ZA201206724B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10881371B2 (en) 2018-12-27 2021-01-05 Medtronic Navigation, Inc. System and method for imaging a subject
US10888294B2 (en) 2018-12-27 2021-01-12 Medtronic Navigation, Inc. System and method for imaging a subject
US11071507B2 (en) 2018-12-27 2021-07-27 Medtronic Navigation, Inc. System and method for imaging a subject

Families Citing this family (4)

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JP6083914B1 (ja) * 2016-03-23 2017-02-22 新明工業株式会社 配線溝形コイルレスモータ
EP3517896B1 (fr) * 2018-01-30 2020-12-30 Mecos AG Capteur de position radiale sans contact ayant un comportement de réponse amélioré aux défauts de cible
KR102030063B1 (ko) * 2018-04-19 2019-11-29 김병국 속도감지회로 일체형 전동기
US11343947B2 (en) * 2018-09-26 2022-05-24 Rohr, Inc. Power converter cooling

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10881371B2 (en) 2018-12-27 2021-01-05 Medtronic Navigation, Inc. System and method for imaging a subject
US10888294B2 (en) 2018-12-27 2021-01-12 Medtronic Navigation, Inc. System and method for imaging a subject
US11071507B2 (en) 2018-12-27 2021-07-27 Medtronic Navigation, Inc. System and method for imaging a subject
US11364006B2 (en) 2018-12-27 2022-06-21 Medtronic Navigation, Inc. System and method for imaging a subject
US11771391B2 (en) 2018-12-27 2023-10-03 Medtronic Navigation, Inc. System and method for imaging a subject

Also Published As

Publication number Publication date
EP2592728B1 (fr) 2023-07-05
JP2013102672A (ja) 2013-05-23
RU2012137168A (ru) 2014-03-10
ZA201206724B (en) 2013-05-29
EP2592728A3 (fr) 2017-02-22
KR20130051398A (ko) 2013-05-20
US9300194B2 (en) 2016-03-29
CN103107667A (zh) 2013-05-15
US20130113222A1 (en) 2013-05-09

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